{"id":7021,"date":"2019-06-08T05:30:12","date_gmt":"2019-06-08T12:30:12","guid":{"rendered":"https:\/\/www.couchbase.com\/blog\/?p=7021"},"modified":"2025-06-13T23:42:51","modified_gmt":"2025-06-14T06:42:51","slug":"n1ql-query-basic-order-of-execution","status":"publish","type":"post","link":"https:\/\/www.couchbase.com\/blog\/pt\/n1ql-query-basic-order-of-execution\/","title":{"rendered":"N1QL (Consulta) Ordem b\u00e1sica de execu\u00e7\u00e3o."},"content":{"rendered":"

A sintaxe da consulta \u00e9 limitada. As consultas s\u00e3o ilimitadas.<\/p><\/blockquote>\n

Empurramento de predicado<\/a>, agrupar por pushdown<\/a>, pagina\u00e7\u00e3o de deslocamento<\/a>, pagina\u00e7\u00e3o do conjunto de teclas<\/a>, otimiza\u00e7\u00e3o da uni\u00e3o<\/a>, otimiza\u00e7\u00e3o de pesquisa<\/a>J\u00e1 discutimos tudo isso. Ainda assim, \u00e9 importante entender o fluxo de execu\u00e7\u00e3o padr\u00e3o e simples - embora lento - da consulta.<\/p>\n

Lukas Eder explicou o ordem real de execu\u00e7\u00e3o do SQL<\/a>. Como o N1QL \u00e9 inspirado no SQL e o segue de perto, essa explica\u00e7\u00e3o tamb\u00e9m se aplica aqui. Recomendo muito a leitura.<\/p>\n

Com o N1QL, voc\u00ea pode usar a explica\u00e7\u00e3o visual para ver a estrutura do plano e o fluxo de dados. Essa \u00e9 uma maneira f\u00e1cil de entender a ordem de execu\u00e7\u00e3o antes de otimizar o desempenho por meio da cria\u00e7\u00e3o de \u00edndices. Usei o exemplo de viagem incorporado e, portanto, forcei a varredura prim\u00e1ria com a dica USE INDEX.<\/p>\n

SELECT hotel.name,\r\n       hotel.country,\r\n       COUNT(hr.ratings.Service) csr,\r\n       RANK() OVER(ORDER BY COUNT(hr.ratings.Service) ),\r\n       DENSE_RANK() OVER(ORDER BY COUNT(hr.ratings.Service))\r\nFROM `travel-sample` AS hotel USE INDEX (def_primary)\r\n    INNER JOIN `travel-sample` AS airport ON (hotel.country = airport.country)\r\n        LEFT OUTER UNNEST hotel.reviews AS hr\r\nWHERE hotel.type = \"hotel\"\r\n    AND airport.type = \"airport\" (aeroporto.tipo = \"aeroporto\")\r\n    AND hr.ratings.Service >= 4\r\nGROUP BY hotel.name,\r\n         hotel.country\r\nHAVING COUNT(hr.ratings.Service) > 0\r\nORDER BY COUNT(hr.ratings.Service)\r\nOFFSET 0\r\nLIMITE 10<\/pre>\n
Aqui est\u00e1 o plano visual.  A execu\u00e7\u00e3o do plano e o fluxo de dados s\u00e3o de baixo para cima. Come\u00e7a com uma varredura de \u00edndice prim\u00e1rio e uma varredura de \u00edndice secund\u00e1rio e termina com o operador de pagina\u00e7\u00e3o LIMIT antes de retornar os resultados para o aplicativo.<\/p>\n
A explica\u00e7\u00e3o visual \u00e9 interativa.  Voc\u00ea pode clicar em cada operador para ver os par\u00e2metros definidos para esse operador pelo otimizador, conforme mostrado para alguns dos operadores abaixo.<\/p>\n
\"\"<\/a><\/p>\n
\"\"<\/a>\"\"<\/a>\"\"<\/a><\/p>\n
O plano de consulta come\u00e7a com isso, logicamente.  Todas as otimiza\u00e7\u00f5es que se seguem a isso s\u00e3o pensadas por pessoas\/ferramentas e selecionadas pelo otimizador para construir uma m\u00e1quina de fluxo de dados para cada consulta.  O objetivo do otimizador \u00e9 criar m\u00e1quinas que fa\u00e7am o m\u00ednimo de trabalho poss\u00edvel e ainda forne\u00e7am os resultados corretos.<\/p><\/blockquote>","protected":false},"excerpt":{"rendered":"
Query syntax is limited. Queries are unlimited. Predicate pushdown, group by pushdown, offset pagination, keyset pagination, join optimization, search optimization, we’ve discussed it all. Still, it’s important to understand the default, simple — albeit slow — execution flow of the […]<\/p>","protected":false},"author":55,"featured_media":7028,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[1815,1812],"tags":[1572,2375,1725,1906,2376],"ppma_author":[8929],"class_list":["post-7021","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-best-practices-and-tutorials","category-n1ql-query","tag-database","tag-explain","tag-nosql-database","tag-optimizer","tag-plan"],"acf":[],"yoast_head":"\nN1QL (Query) Basic Order of Execution. - The Couchbase Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.couchbase.com\/blog\/pt\/n1ql-query-basic-order-of-execution\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"N1QL (Query) Basic Order of Execution.\" \/>\n<meta property=\"og:description\" content=\"Query syntax is limited. 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Keshav \u00e9 bacharel em Ci\u00eancia da Computa\u00e7\u00e3o e Engenharia pela Universidade de Mysore, \u00cdndia, det\u00e9m onze patentes nos EUA e tem quatro patentes pendentes nos EUA.","sameAs":["https:\/\/blog.planetnosql.com\/","https:\/\/x.com\/rkeshavmurthy"],"url":"https:\/\/www.couchbase.com\/blog\/pt\/author\/keshav-murthy\/"}]}},"authors":[{"term_id":8929,"user_id":55,"is_guest":0,"slug":"keshav-murthy","display_name":"Keshav Murthy","avatar_url":"https:\/\/secure.gravatar.com\/avatar\/af74df754db27152971d0aed2f323ead5a1f9fe5afd0209af91e12e784451224?s=96&d=mm&r=g","first_name":"Keshav","last_name":"Murthy","user_url":"https:\/\/blog.planetnosql.com\/","author_category":"","description":"Keshav Murthy \u00e9 vice-presidente de P&D da Couchbase. Anteriormente, ele trabalhou na MapR, IBM, Informix e Sybase, com mais de 20 anos de experi\u00eancia em design e desenvolvimento de bancos de dados. Ele liderou a equipe de P&D de SQL e NoSQL na IBM Informix. Recebeu dois pr\u00eamios President's Club na Couchbase e dois Outstanding Technical Achievement Awards na IBM. Keshav \u00e9 bacharel em Ci\u00eancia da Computa\u00e7\u00e3o e Engenharia pela Universidade de Mysore, \u00cdndia, det\u00e9m dez patentes nos EUA e tem tr\u00eas patentes pendentes nos EUA."}],"_links":{"self":[{"href":"https:\/\/www.couchbase.com\/blog\/pt\/wp-json\/wp\/v2\/posts\/7021","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.couchbase.com\/blog\/pt\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.couchbase.com\/blog\/pt\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.couchbase.com\/blog\/pt\/wp-json\/wp\/v2\/users\/55"}],"replies":[{"embeddable":true,"href":"https:\/\/www.couchbase.com\/blog\/pt\/wp-json\/wp\/v2\/comments?post=7021"}],"version-history":[{"count":0,"href":"https:\/\/www.couchbase.com\/blog\/pt\/wp-json\/wp\/v2\/posts\/7021\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.couchbase.com\/blog\/pt\/wp-json\/wp\/v2\/media\/7028"}],"wp:attachment":[{"href":"https:\/\/www.couchbase.com\/blog\/pt\/wp-json\/wp\/v2\/media?parent=7021"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.couchbase.com\/blog\/pt\/wp-json\/wp\/v2\/categories?post=7021"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.couchbase.com\/blog\/pt\/wp-json\/wp\/v2\/tags?post=7021"},{"taxonomy":"author","embeddable":true,"href":"https:\/\/www.couchbase.com\/blog\/pt\/wp-json\/wp\/v2\/ppma_author?post=7021"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}